Support stand



FIG. 1 is a perspective view of a support stand showing the inventive design.

FIG. 2 shows a front view thereof.

FIG. 3 shows a back view thereof.

FIG. 4 shows a top view thereof.

FIG. 5 shows a bottom view thereof.

FIG. 6 shows a left view thereof; and,

FIG. 7 shows a right view thereof.

The broken lines appearing in these figures are included for the purposes of illustrating environment and forms not part of the claimed design. 

The ornamental design for a support stand, as shown and described. 